types/views: move AsMap to Map from *Map

This was a typo in 2e19790f61.
It should have been on `Map` and not on `*Map` as otherwise
it doesn't allow for chaining like `someView.SomeMap().AsMap()`
and requires first assigning it to a variable.

Updates #typo

Signed-off-by: Maisem Ali <maisem@tailscale.com>
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